As has been reported before, the phone will support 4G LTE. This shouldn't come as much of a
surprise considering Apple already implemented it with the new
iPad.

In terms of screen size, iMore's sources indicate that the new
phone will be mostly unchanged in that area. Expect a similar
3.5-inch screen.

In what is perhaps one of the more dramatic changes, Apple is
attempting to reduce the size of its 30-pin dock connector. With
a so-called "micro-dock" in place, it frees up room inside the
device for more components.